I asked about this recently, to summarise the replies I got:

Pull up and dispose of (i.e. in bin, not on compost heap). Try to pull up some root with it. Do this frequently (weekly). Do not hoe - each bit left behind will grow.

You can use Glyphosphate (e.g. Roundup) but this will have limited effect; the waxy coat of the plant prevents effective absorption. Beating with the back of a spade, to bruise the plant, and then use Glyphosphate may help - others said that when bruised the plant just diverts its energises elsewhere, so waste of time & money!

I reckon it is worth doing the Glyphosphate thing, waiting a week for it to be absorbed, and then pulling the tops off

ammonium sulphamate crystals (sold as 'Deep Root' by 'Growing success') reputedly has better effect than Glyphosphate

Covering with woven mulching sheet may not work, the shoots may manage to grow through.